Effects of Saturation Magnetization on Thermomagnetic Convection in a Bi-Heater Configuration
Sumanta Banerjee1,a, Achintya Mukhopadhyay1,b, Swarnendu Sen1,c and Ranjan Ganguly2
1Mechanical Engineering Department, Jadavpur University, Kolkata 700 033, India.
asbandyopadhyay.mechanical@gmail.com
bamukhopadhyay@mech.jdvu.ac.in
cdrssen@mech.jdvu.ac.in
2Power Engineering Department, Jadavpur University, Kolkata 700 098, India.
ranjan@pe.jusl.ac.in
ABSTRACT
Steady-state thermomagnetic convection in a square cavity is simulated at zero-gravity conditions under the action of two symmetrically-placed line dipoles. Two heaters of identical sizes and flux-strengths are flush-mounted on the bottom wall. Effects of magnetization saturation of the ferrofluid (at higher field strengths) on convective heat transfer are explored. The asymptotic variation of heater Nusselt number with increasing magnetic field intensity is explained from the standpoint of the fundamental physics governing superparamagnetic behavior. Field plots of magnetization and of Kelvin body force lines aid in visualization of the augmentation of magnetic polarization forces with increasing field intensities that augment magnetothermal advection.
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